库车山前超深高温高压气井修井配套工艺技术  

Supporting techniques for workover of ultra-deep,high-temperature and high-pressure gas wells in Kuqa piedmont

作　　者：徐鹏海 马群 张莎 张馨云 迟臻 XU Penghai;MA Qun;ZHANG Sha;ZHANG Xinyun;CHI Zhen(Kela Oil&Gas Production Management District,PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000,China;New Ener-gy Division,PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000,China;Emergency Response Center,PetroChina Tarim Oilfield Company,Korla,Xinjiang 841000,China)

机构地区：[1]中国石油塔里木油田公司克拉采油气管理区,新疆库尔勒841000 [2]中国石油塔里木油田公司新能源事业部,新疆库尔勒841000 [3]中国石油塔里木油田公司应急中心,新疆库尔勒841000

出　　处：《天然气技术与经济》2023年第2期47-52,74,共7页Natural Gas Technology and Economy

基　　金：中国石油天然气股份有限公司重大科技专项“克拉—库车坳陷深层—超深层天然气田开发关键技术研究与应用”(编号:2018E-1803)。

摘　　要：塔里木盆地库车山前高压气井具有典型的“三超(超深、超高压、超高温)”特点,气井生产工况极为苛刻、复杂。近年来,随着库车山前油气开发的不断深入,油管渗漏、断裂、变形等管柱失效事件逐年增加,管柱失效导致的井控风险进一步加大,尤其是一级井屏障失效后,A环空高压气体可能窜通至外环空或地面,井控、环保风险不可接受,而大修作业是恢复井屏障的唯一途径。为了安全、高效地实施库车山前高压气井大修作业,以井筒为研究对象,分析了不同井屏障状态下的压井配套工艺技术、复杂大修工艺技术。经过不断探索,攻关形成了压井工艺、原井管柱处理、带压作业配合修井等相关配套工艺技术。研究结果表明:①正反循环挤压井等压井工艺、带压作业处理浅部断脱管柱等配套工艺技术适用于山前大修井;②山前常用的油管柱处理方式可选择倒扣、切割、钻磨等;③THT封隔器可以选用钻磨、套铣打捞的处理方式。结论认为:①正反循环挤压井等压井工艺、带压作业处理浅部断脱管柱等配套工艺技术适用于山前大修井;②油管柱先切割、再打捞是最高效的原井管柱处理方式;③套铣打捞工艺处理THT封隔器成功率、作业效率最高。Most high-pressure gas wells in Kuqa piedmont of Tarim Basin possesses three-extra typical natures in drilling depth,high temperature and pressure,leading to extremely severe and complex production conditions.With the develop⁃ment process in this piedmont,tubing-string failures,like leakage,breakage and deformation,have increased in recent years,creating additional well-control risks.Especially,there exists high-pressure gas channeling in A-annulus to outer annulus or surface once the primary well barrier is in failure,and well-control and environmental risks are unacceptable.Consequently,workover as an exclusive tool can recover the barrier.For purpose of the safe and efficient workover in these high-pressure gas wells,the well killing and complicating workover techniques under different barrier conditions were ana⁃lyzed by taking wellbore as an objective.Supporting techniques and processes were put forward,including well-killing technique,treatment of primary wellbore string and workover while operating under pressure.Results show that(i)to select a proper well-killing technique depending upon barrier conditions is the prerequisite for the successful workover;(ii)tub⁃ing-string treatment methods commonly used in Kuqa piedmont include back-off,cutting and grinding;and(iii)THT pack⁃ers can be processed by means of grinding and washover.It is concluded that such killing techniques as normal/reversecirculating squeeze well and treatment of broken/disconnected string in the shallow under pressure are effective for work⁃over in piedmonts;tubing-string fishing after cutting is the most efficient for the primary wellbore string;and washover is the most successful and most efficient fishing technique for the THT packers.

关 键 词：塔里木油田 库车山前 高压气井 修井 配套工艺 

分 类 号：TE37[石油与天然气工程—油气田开发工程]